I've been in this industry now for 35 years, and while there is some tech from my starting point that is still around, works fine, and could still be used effectively today... few people know how to use it, so from a pragmatic perspective, it is useless.So your starting point for this question needs to focus on that evolution of talent. Your app needs to be well-defined and compartmentalized so that each layer can be refactored when (not if) the talent pool dwindles to nothing. You need to devel...